12515422 has 4 divisors (see below), whose sum is σ = 18773136. Its totient is φ = 6257710.

The previous prime is 12515407. The next prime is 12515423. The reversal of 12515422 is 22451521.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 12515393 and 12515402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12515423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3128854 + ... + 3128857.

It is an arithmetic number, because the mean of its divisors is an integer number (4693284).

Almost surely, 2^12515422 is an apocalyptic number.

12515422 is a deficient number, since it is larger than the sum of its proper divisors (6257714).

12515422 is an equidigital number, since it uses as much as digits as its factorization.

12515422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6257713.

The product of its digits is 800, while the sum is 22.

The square root of 12515422 is about 3537.7142337956. The cubic root of 12515422 is about 232.1748459001.

Adding to 12515422 its reverse (22451521), we get a palindrome (34966943).

The spelling of 12515422 in words is "twelve million, five hundred fifteen thousand, four hundred twenty-two".